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You want to look up Es in the dictionary - It's one of the few words in German that look the same in both singular and plural and in all cases. So your claim "it's singular" is wrong.
– tofroJul 28 '17 at 14:06

1

Actually, when used as a pronoun, there is a plural: "sie". Wo ist das Kind? Es ist in der Schule. / Wo sind die Kinder? Sie sind in der Schule. However, es is often not a pronoun but a mere placeholder, and in this case there is no distinct plural.
– RHaJul 28 '17 at 16:12

2

"Es ist" and "Es sind" in this context are respectively equivalent to English "There is" and "There are" .
– NetwOrchestrationJul 29 '17 at 9:28

3 Answers
3

The pronoun "es" is not only used as a personal pronoun (like er, sie, es, …). It has several more functions in German. In these functions "es" is sometimes called a placeholder, or impersonal "es" or empty "es" (unpersönliches "es", leeres "es"), or a "dummy pronoun". A linguistic term is »expletives "es"« / English: syntactic expletive. What it means is that it fills an otherwise empty spot of a subject or object in a sentence construction. It is in this function that "es" stands independent of gender and number.